NW wildfires promote haze over Colo.

Cows stand in a pasture as a wildfire burns down a hillside behind Tuesday, Aug. 14, 2012, near Cle Elum, Wash. The fast-moving wildfire has burned 60 homes across nearly 40 square miles of central Washington grassland, timber and sagebrush. No injuries have been reported but more than 400 people have been forced to flee. (AP Photo/Elaine Thompson)

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Haze over Summit County this week is due to wildfires in Idaho and Washington. A cold front is expected to move across northern Colorado this afternoon, with high temperatures across the plains and Front Range. The front will have less effect in the mountains, although isolated thunderstorms are expected to develop this afternoon.